Combined home recording disk and stylus therefor



Oct. 17, 1933. F, c BARTQN 1,930,502

COMBINED HOME RECORDING DISK AND STYLUS THEREFOR Filed Aug. 15, 1950 V Ah Cil Patented Oct. 17, 1933 UNETED STATES ars "st CiDD'HEKNED HOMERECQIRDING DISK AND STYLUS THEREFOR Frederick 6. Barton, Haddonfield, N.5., assignor,

by me of Ame ca, of Delaware Application August 15, 1931). Serial No.475,411

lei Claims.

D For example, it is desirable to use a fibre stylus in the reproductionof certain types record tablets to prevent injury to the reoord--grooves and thereby to prolong the effective life thereof, whereas theusers may deliberately or inadvertently employ a h. "d steel stylusWithout appreciating the possibi ty of damage.

Another example may be found in record tablets particularly adapted forhome record ing and reproduction which tablets are usually soft and aremade of flexible material or have other peculiar characteristics.

In short, it is essential, in order to protect the record tabletsagainst abuse and to best results that the tablets be initially recordedand subsequently reproduced with the proper stylus in contact therewith.

' t erefore, an object of my stylus with a phonogr.

further object of my invention is to pa 1: a special stylus into or topackage a special styles with a phono 'raph record whereby the twoco-operating elements may be distributed i sold as a single-article ofmerchandise.

5 With the above objects in View, and other bjects which will becomeapparent hereinafter,

invention des in the method of combining a use in conn or" merchandiseand the structure th same e accompanying drawing which: l is a plainview of a Fig. 2 is an enlarged liagn entary sectional View on the line2-2 of Fig. 1.

Fig. 3 is an enlarged fragmentary sectional view similar to Fig, 2illustrating a stylus combined with a homogeneous type of record tablet.

Fig. 4 is a fragmentary plan view of a modification wherein the stylusis positioned across the center opening normally found in a recordtablet or disk. p 9 Fig. 5 is an enlarged fragmentary sectional T...'nvention is illustrated. by way of example t assignments, to RadioCorporation New .York, N. Y., a corporation view illustrating thedislodging of the stylus from the record disk upon placing the disk intoco-operative engagement with a turntable.

Fig. 6 is an accentuated fragmentary sectional view similar to Fig. 2.

Fig. 7 is an accentuated fragnientary View similar to Fig. 3.

Referring to the drawing reference character ional 19 designates aphonograph record tablet or disk having a central opening 11, a labelarea 12 and an area occupied by a spiral groove of predetermined lengthas indicated at 13.

For the purposes of this invention the record table may be constructedas shown in 2, comprising an inert fibrous core 14, such as cardboard,blotting paper or the like which is faced on both sides with a sheet orlayer of cellulose acetate or nitrate 15 or like material, the said coreand cellulose layer being suitably joined together in a manner wellknown to those skilled in the art. A disk or tablet structure as aboveset forth may be utilized as one form particularly adaptable for homerecording'purposes as disclosed in an application by Albertis Hewitt,filed Sept. 6, 1930, Serial No. 480,059, and assigned to RCA VictorCompany, Inc, wherein a special stylus is used in con junction with sucha record disk for graying a spiral guide groove pro-formed therein inaccordance with variable-sound or modulated electrical currents.

accordance with my invention, the record disk 10 is provided with ashor, rectangular opening or slot 16 communicating with the centralopening 11 for the purpose of accommodating a part or most of the sha ofa stylus 17, one end of which preferably the pointed end, extends intothe opening 11. The stylus may be retained in the slot 16 any do edmanner. Preferably, for the sake of simplaity and ease in assembly, useis made of the resilient character of the record tablet or disk 10 tofrictionally retain the stylus 17 in place in the slot 16.

In preparing the record ii) for the reception or". a stylus, therectangular opening or slot 16 is suitably formed so as to have a widthslightly less than the diameter of the stylus. The stylus 17 may then bepressed or forced into the slot 16 by suitable means until the saidstylus is below or substantially flush with the plane surfaces of therecord disl: 10.

In an alternative arrangement, the slot or opening 16 may be formedacross the disk or tablet opening 11 as illustrated in Fig. 4. Thepurpose of locating the slot 16 so that the stylus I than the diameter15 extends into or across the center opening 11 normally in a recorddisk or tablet is to provide for the convenient and facile removal ofthe stylus 17 from the record disk or tablet 10 at t1 e time of its use.Referring to Fig. 5, it will be readily apparent that by placing thedisk 10 on a turntable 18 with the opening 11 of the disk. 10 inregistration with the turntable spindle 19 and pressing the centralportion 12 of the said disk down over the said spindle, the latter willproject through the opening 11 and cause the stylus 17 to be eithercompletely displaced or at least sufficiently displaced to be readilyand easily removable from its retaining slot 16 in the said record diskor tablet 10.

In a record structure such as illustrated, for example, in Figs. 1 and2, the slot 16 is, preferably, so formed as to have a width slightlyless of the stylus 17. Consequently, in pressing the said stylus intothe slot 16, the edge portions 20 of the slot in the resilient surfacelayers 15 of the disk 10 are momentarily flexed during the entrance ofthe stylus 1'7 into the slot 16 and subsequently return to theiroriginal position after the stylus has reached the center or coreportion 14 of the disk, which portion is easily displaced or urgedlaterally by the stylus 1'7.

From the above description, it will be readily apparent that theresilient surface layers 15 provide a suitable means for yieldably andeffec tively retaining the stylus 1'? within the opening or slot 16.

In a homogeneous type of record tablet structure 10 as illustrated inFig. 3, the slot or opening 16 is so formed as to have a width slightlyless than the diameter of the stylus 17 in order that the same may beretained in the slot due to its frictional contact with the side wallsthereof when forced or pressed thereinto.

Further, in connection with Fig. 3, the stylus 17 is removed from theslot or opening 16 in a manner identical with that disclosed inconnection with Fig. 5.

The invention having been exemplified by application to a phonographrecord tablet or disk, it to be understood that the disclosed subjectmatter may be embodied in many other forms than those illustratedanddescribed, and therefore, no limitations of structure are to be imposedon the invention herein set forth except as may be implied from thescope of the appended claims.

I claim as my invention:

1. In combination, a phonograph record. tablet having a central openingand a second opening extending radially from and communicating with saidfirst named opening, and a stylus disposed and frictionally retained insaid second opening.

2. In combination, a phonograph record tablet having a central openingand a slot extending radially from and communicating with said firstnamed opening, and to stylus frictionally held in said slot, said slotbeing of such length that a portion of said stylus extends into saidcentral opening.

3. In combination, a laminated record tablet comprising an inert coreand resilient surface layers, and a stylus imbedded in said core andremovably retained therein by said surface layers.

e. In combination, a phonograph record-tablet having a center openingand a stylus, the stylus being carried by the tablet to extend at leastpartially into the center opening thereof whereby the act of threadingthe tablet upon the spindle of a record support causes said stylus to bepartially removed from said tablet.

5. In combination, a phonograph record-tablet having a center openingand a stylus, the stylus being carried by the tablet to extend acrossthe center opening thereof, whereby the act of threading the tablet uponthe spindle of a record support causes said stylus to be substantiallyremoved from said center opening.

6. In combination, a laminated record tablet comprising an inert coreand resilient surface layers, said tablet having a central openingthereinand a second opening extending radially from and communicatingwith said first named opening, and a stylus partly disposed in saidsecond opening and movably retained therein by said surface layers.

7. In a laminated record-tablet provided with a center opening andhaving a slot communicating therewith for the reception of a stylus,means comprising the outer laminations of said tablet for removablyretaining a stylus in said slot.

8. In a laminated record-tablet provided with a center opening andhaving a slot communicating therewith for the reception of a stylus,means comprising the outer laminations of said tablet for reinovablyretaining a stylus in said slot substantially below the outer surfacesof said record-tablet.

9. A laminated record tablet comprising a core member provided with aslot adapted to receive a stylus, and surface members having slotsregistering with said first named slot, the edge portions of saidsurface members which define said second named slots permittinginsertion of the stylus into said and being stylus therein.

10. In combination, a phonograph record tablet having a central openingand a second opening communicating with said first named opening, and astylus disposed in said second opening and frictionally retained bymarginal portions thereof, a part of said said central opening wherebysaidstylus is at least partially dislodged upon placing said recordtablet upon a turntable spindle.

11. In combination, a laminated let. comprising an inert core andresilient surface layers, said tablet having a central opening therein,a slot extending from and communicating with said opening, and a stylusimbedded in said slot and removaby retained therein by said surfacelayers.

12. In combination, a phonograph record tablet having a central openingtherein and a plurality of diametrically opposed slots communicatingwith said opening, and a stylus imbedded in said slots and so extendingacross said opening as to be ejected therefrom upon the insertionthrough said opening of a member having a diameter substantially thesame as said opening.

13. In combination, a laminated record-tablet comprising an inert coreand resilient surface layers, and a stylus imbedded in said core andfirst named slot 7 of sufficient rigidity to retain the H stylusextending into record tabremovably retained therein solely by said sur I

